I don't know coz I don't have a v4.5, but I think it works the same way as all the versions; my v3 and v4 mated, you just gotta connect 24/7. And then they like eachother heaps and, with v3 and v4 atleast, the day after they both evolve into adults (I say this coz v3s evolve into adults 1 day after v4s) you connect and they mate.
Hope this helps! :furawatchi: